31. An atom of helium has a mass about four times greater than that of an atom o

Question

31. An atom of helium has a mass about four times greater than that of an atom of hydrogen. Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements? A There are about four times as many helium atoms as hydrogen atoms. B) There are about two times as many helium atoms as hydrogen atoms. C) The number of helium and hydrogen atoms is the same. D) There are about half as many helium atoms as hydrogen atoms. E) There are about one-fourth as many helium atoms as hydrogen atoms

Explanation / Answer

Since equal weight of the two elements are taken, the number of moles of H atom is equal to 4 times the number of moles of He atom( since weight of He= 4 times the weight of H). Therefore (E) is correct i.e., there are one-fourth as many helium atoms as hygrogen atoms.

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